Upgrade to Pro
— share decks privately, control downloads, hide ads and more …
Speaker Deck
Features
Speaker Deck
PRO
Sign in
Sign up for free
Search
Search
FM放送とマルチパスを適応フィルタで極めてみた / Solving multipath dis...
Search
Kenji Rikitake
January 16, 2020
Technology
1
3.5k
FM放送とマルチパスを適応フィルタで極めてみた / Solving multipath distortion of FM broadcast by adaptive filters
さくらの夕べ 研究所ナイト 2020年1月16日 発表原稿
Kenji Rikitake
January 16, 2020
Tweet
Share
More Decks by Kenji Rikitake
See All by Kenji Rikitake
SDR Implementation of Analog FM Broadcast Multipath Filter
jj1bdx
0
820
インターネットとオープンな無線技術の今後 / Future of Internet and Open Radio Engineering
jj1bdx
0
1.2k
ソフトウェアラジオとC++ そしてFMエアチェックのための信号解析と数値計算にまつわるよもやま話 / Software radio and C++
jj1bdx
0
1k
SDR時代のFM受信 マルチパスモニタとマルチパスフィルタ / FM broadcast reception with SDR - multipath monitor and multipath filter
jj1bdx
0
620
How I discover a working implementation of clock_nanosleep() for macOS in CPAN Time::Hires
jj1bdx
1
1.2k
Sleeping pays / 1000eng-74th-jj1bdx
jj1bdx
1
49
The BEAM Programming Paradigm
jj1bdx
1
950
Safe randomness: theory and practice
jj1bdx
1
1.4k
ただの失業したインターネット屋は果たして独立開業できたのか? / Did the fired internet engineer finally start up his business successfully as an independent consultant?
jj1bdx
1
450
Other Decks in Technology
See All in Technology
What’s new in Android development tools
yanzm
0
310
20250705 Headlamp: 專注可擴展性的 Kubernetes 用戶界面
pichuang
0
270
Operating Operator
shhnjk
1
580
United airlines®️ USA Contact Numbers: Complete 2025 Support Guide
unitedflyhelp
0
310
ビズリーチが挑む メトリクスを活用した技術的負債の解消 / dev-productivity-con2025
visional_engineering_and_design
3
7.5k
United Airlines Customer Service– Call 1-833-341-3142 Now!
airhelp
0
170
成長し続けるアプリのためのテストと設計の関係、そして意思決定の記録。
sansantech
PRO
0
120
2025-07-06 QGIS初級ハンズオン「はじめてのQGIS」
kou_kita
0
170
AI時代の開発生産性を加速させるアーキテクチャ設計
plaidtech
PRO
3
150
2025 AWS Jr. Championが振り返るAWS Summit
kazukiadachi
0
110
american airlines®️ USA Contact Numbers: Complete 2025 Support Guide
supportflight
1
110
OPENLOGI Company Profile for engineer
hr01
1
34k
Featured
See All Featured
Designing for Performance
lara
610
69k
Reflections from 52 weeks, 52 projects
jeffersonlam
351
20k
Templates, Plugins, & Blocks: Oh My! Creating the theme that thinks of everything
marktimemedia
31
2.4k
Rebuilding a faster, lazier Slack
samanthasiow
82
9.1k
Cheating the UX When There Is Nothing More to Optimize - PixelPioneers
stephaniewalter
281
13k
Product Roadmaps are Hard
iamctodd
PRO
54
11k
Testing 201, or: Great Expectations
jmmastey
43
7.6k
CoffeeScript is Beautiful & I Never Want to Write Plain JavaScript Again
sstephenson
161
15k
Become a Pro
speakerdeck
PRO
29
5.4k
Designing for humans not robots
tammielis
253
25k
Large-scale JavaScript Application Architecture
addyosmani
512
110k
Visualization
eitanlees
146
16k
Transcript
FM์ૹͱϚϧνύεΛ దԠϑΟϧλͰۃΊͯΈͨ Kenji Rikitake / Sakura Lab Night 16-JAN-2020 1
Kenji Rikitake Γ͖͚ͨ ͚Μ͡ ྗ ݈࣍ 16-JAN-2020 ͘͞Βͷ༦ ݚڀॴφΠτ Sakura
Internet Fukuoka Office Fukuoka City, Fukuoka, Japan @jj1bdx Kenji Rikitake / Sakura Lab Night 16-JAN-2020 2
ٕज़࢜ʢใֶ෦ʣ ྗ݈ٕ࣍ज़࢜ࣄॴ ॴ ϖύϘݚڀॴ ٬һݚڀһ ΞϚνϡΞແઢྺ 44 Kenji Rikitake /
Sakura Lab Night 16-JAN-2020 3
FM์ૹϚϧνύεׯবͰԻ͕Ԛ͘ͳΔ • ෳܦ࿏ͷࣹ͕߹͞Εͯܗ͕ཚΕΔ • ৼ෯Ұఆͷ͕ͣৼ෯͕มԽ͢Δ • ৼ෯ͷมԽଈࠁҐ૬ͷΈ • Ґ૬͕ΉͱͱͯෆշͳԻ͕͢Δ Kenji
Rikitake / Sakura Lab Night 16-JAN-2020 4
Kenji Rikitake / Sakura Lab Night 16-JAN-2020 5
͍͚ͬͯͳ͍͜ͱ ৼ෯Ұఆʹڧ੍ͯ͠Έফ͑ͳ͍! Ϧϛολແҙຯ Kenji Rikitake / Sakura Lab Night 16-JAN-2020
6
ݪཧʹ࣮ʹߟ͑Δ ෳͷԆ৴߸͕ׯব͍ͯ͠ΔͷͰ͋Εɺ ͦͷׯবͷٯԋࢉΛߦͬͯऔΓআ͘ Kenji Rikitake / Sakura Lab Night 16-JAN-2020
7
Kenji Rikitake / Sakura Lab Night 16-JAN-2020 8
Kenji Rikitake / Sakura Lab Night 16-JAN-2020 9
ϚϧνύεׯবҎલͷঢ়ଶʹ͢ʹ • ԆͱՃࢉFIRϑΟϧλͰ࣮ݱͰ͖Δ • ࣹͷٯԋࢉΛΕΑ͍ • LMS๏ͰదԠϑΟϧλΛܾఆ • ͷܾఆ݅: ৼ෯Ұఆʹ͢
Kenji Rikitake / Sakura Lab Night 16-JAN-2020 10
దԠϑΟϧλͷ࣮ྫ 1980ʹจൃද 1 ྛًࢯʹΑΔFMDDC-3 ྗʹΑΔairspy-fmradion 1 ݄ ࢤ, Ӌௗ ޫढ़,
దԠσΟδλϧϑΟϧλʹΑΔFMϚϧνύεͻͣΈࣗಈআڈͷҰํࣜ, ςϨϏδϣϯֶձࢽ, 1985, 39 ר, 3 ߸, p. 228-234, ެ։ 2011/03/14, Online ISSN 1884-9652, Print ISSN 0386-6831, h>ps:/ /doi.org/ 10.3169/itej1978.39.228, h>ps:/ /www.jstage.jst.go.jp/arHcle/itej1978/39/3/39_3_228/_arHcle/-char/ja Kenji Rikitake / Sakura Lab Night 16-JAN-2020 11
దԠϑΟϧλΛVOLKͰ࠷దԽ • ίϯύΠϥʹͤΔͱݶք͕͋Δ • VOLK: SIMD໋ྩద༻ϥΠϒϥϦ h-p:/ /libvolk.org/ • ϧʔϓͰॲཧͰ͖ΔͷΛSIMDʹ͢Δ
• ੵԋࢉ6ഒͷߴԽ2 2 Kaby Lake, volk_32fc_x2_dot_prod_32fc(), generic -> u_avx_fma Kenji Rikitake / Sakura Lab Night 16-JAN-2020 12
#if !VOLK for (unsigned int i = 0; i <
m_filter_order; i++) { output += m_state[i] * m_coeff[i]; } #else // VOLK volk_32fc_x2_dot_prod_32fc(&output, m_state.data(), m_coeff.data(), m_filter_order); #endif // VOLK Kenji Rikitake / Sakura Lab Night 16-JAN-2020 13
ྗͷ࣮: airspy-fmradion Airspy HF+RTL-SDRͱMacRaspberry PiͷΈ߹ΘͤͰಈ࡞ ߴڃFMνϡʔφʹඖఢ FMԕڑड৴ʹޮՌ ઈࢍ։ൃத h"ps:/ /github.com/jj1bdx/airspy-fmradion
Kenji Rikitake / Sakura Lab Night 16-JAN-2020 14
Thank you Graphics credits: • Audacity simula.on: Kenji Rikitake •
Mul.path impulse response: I, Cantalamessa, h>ps:/ / commons.wikimedia.org/wiki/ File:Mul.path_impulse_response.png from Wikimedia Commons, licensed CC BY 2.5 Kenji Rikitake / Sakura Lab Night 16-JAN-2020 15